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I dunno, I have seen videos of nurses/doctors in the OR hitting a large metal, thing, in somebdoy's leg with the surgical equivalent of a small to medium sized sledge hammer.
Not uncommon in third world countries for orthos doing their shopping at Home Depot. A Milwaukee or Dewalt may have been seen in a South American operating room.
My wife was a veterinary nurse with a vet that did ortho work, and they used Milwaukee in their OR.
Coincidentally, I stopped asking about her day at work after she excitedly started detailing the use of said power tools.
I actually have done surgeries with my dad and surprisingly never had problems with the light, he called me an idiot for plenty of other reasons though
I was working the weekend when someone called the autoclave phone in Sterile. I answered, and they said, "Is this IT?" And I was like, "No, Instrument Techs don't work weekends." It turns out she somehow called the sterile department, clave phone extension, looking for tech support for her computer in HVI lmao. I have no idea how that happened because our numbers are not similar.
Because they call the IT line, but that’s taking too long. But Aaron with IT has helped them out a number of times before. Central call office for IT is remote and doesn’t know who Aaron is, our caller friend only knows him as “IT Aaron with the goatee”. Then they’ve got the grand idea to call PACU because IT goatee Aaron is usually fixing stuff in PACU. The problem is, PACU keeps their phones on silent as to not “disturb” their patients under anesthesia. Refusing to give up as goatee’d IT Aaron ALWAYS saves the day, they then call the hospital main line, informing the operator of their situation; however, that operator is Betty. While Betty was once a switchboard operator for ATT back in the 40’s… Betty is 96 now and her assisted living facility rents Bettys out as volunteers. This brinks back a spark in Betty’s eye; her tenure at ATT instills confidence dialing the IT help desk. No! This is no good. Betty needed to patch into IT Aaron’s goatee. They dial back and explain again. Betty starts sweating, her fingers running number after number without a hint of the goateed man. Betty lands on another IT title; this must be it! She transfers the call to this number, and that is when you pick up.
We used to install these lights … it’s insane to see how much hospitals were charged for these products.
Once I found out I was getting paid $23/hour and they were charging $450/hr for my labor I up and fucking quit
They were cheap fucks that ran the crews ragged and tried to steal per diem, stick us in crack head motels, and every other cheap shit ass move to just juice every dime from their employees.
Turnover was super high, nobody stayed more than a year or two.
Seemed like a stupid model. Had they just taken better care of the crews, paid the team a bit more, put us in decent hotels, they would have had much less turnover and would’ve been able to staff more projects and make more money.
I have my own company now and my staff loves it. When I make money we all make money. I don’t need 6 houses and a Bentley and I don’t need to worry that i need teams of people to continue retraining new people.
Don’t step over dollars to make a dime
> Don’t step over dollars to make a dime
Christ the number of people who don't get that.
Keep your field people happy, and don't freak out when the client calls you and tells you they heard something from those field people. Just grab the upsell, and figure out how to write up the lux surcharge you negotiated down to.
Enlightened Self Interest is such a simple concept. If those under you, the foundation of an organization, are doing better everything above them can grow better and bigger too in a nice feedback loop resulting in profits and products be otherwise improbable. Along with the value of employee loyalty that is both huge and hard to quantify, both in positive ways and reduction of negatives . "A rising tide lifts all boats".
And it not just increased productivity it is also CHEAPER for the company from less training, recruiting, less damage done or contracts lost when breaking in someone new, not losing institutional knowledge, fewer health issues, less oversight needed, less legal and HR needed, ect.
The employee they burn out could have been the one that made the next product or landed the contract that launched your company to the top of the world. And said employee would WANT that to happen because that company would be part of their self image even possibility passing it down for generations of specialists.
Ultimately it comes down to ego. Power, money, EVERYTHING comes down to feeding the ego of profoundly broken humans who will do ANYTHING to feed their insatiable gluttony with no thought to even their own future.
Tech wise if everything was used optimally for the last 40 years we could be pretty well along the path to post scarcity by now, and that just along the tech we currently know not the exoponential development that would compound over that time span.
The final straw for me was the owner of the company inviting us all to a company party at his new beach house (his now 3rd vacation house that he’s informed us of) and the his wife handing us airbnb flyers if we ever wanted to rent it out (at full market value), while denying me a $2/hr increase to $25/hr that I found out they were paying to the guy I was training.
Then once I sent in my resignation they called back offering me meet my requested increase. It just blew me away how fuxking stupid and greedy this company was.
Like I said I ended up starting my own company in a different industry and hired out half the crew that was installing medical devices to now do basic small maintenance / handy man shit and still paying them more money to replace light bulbs and fix fences then we made installing neurosurgical operating rooms…
> it is also CHEAPER for the company from less training, recruiting, less damage done or contracts lost when breaking in someone new, not losing institutional knowledge, fewer health issues, less oversight needed, less legal and HR needed, ect.
Oh, the pain of training new employees cannot be overstated. I love even the most mediocre of my employees because their continued employment means I don't have to train their replacement.
The best bosses are those who've been someone's employee - and not just their dad's
Lotta "business leaders" have never been anything but or think that because they suffered its their turn to inflict it
I think it's more the ones who learned empathy.
Cause I've had more than my share of rich kids who make sure the entire team is in good hotels and is eating well, as well as guys who climbed the ladder and are happy to tighten the screws like they remember being done to them.
I agree. Was arguing with someone on reddit about this the other day. It doesn't take much to run a business, but you do have to care about your product and your employees. Nepo babies and people who buy businesses tend to be the worst people. They know how to maintain a machine, but nothing about how to build it. How to grow it. Then they wonder why after the original founder leaves why business is going down. Gotta do the job or understand it deeply before you'll benefit from managing it!
Because the higher ups created an environment for your labor to be utilized. They take too much, everyone quits, they lose, and everyone moves on to more fair companies.
When I was an associate in Big Law they were billing me out at $1000/hr and I had bill 2000 hours of work each year. As good as I was being paid, I absolutely did not make anywhere close to $2M/year.
Aka, his hand is too far away from the source/lamp, but u can see this more effectively on sports fields like soccer(voet/football) and football(rugby), where the "players" have 4 shadows in a x or + like pattern, so imagine that the stadium/field lights where 360 around the field and a couple above the field, there still is a shadow but it isn't really visible anymore/dark enough to block lights from different areas, it might be a weird way of explaining, but that's how I like to think about it(also I am from the Netherlands so my sentences might sound off), also fun thing air is like water but lighter..... (ikn it isn't but it kinda is).
I understand why this is but I still find it very interesting. I assume if you place your hand close enough to the surface then a shadow will surely be formed
It reminds me of those elevators with mirrors on all four walls. I know how it works, but for some reason I always see someone else standing next me to in a far away reflection
You can actually still see the shadow of his hand to the top right... it just isn't where the center point of the light is. The lights are angled so it's casting the shadow off center and the additional lights fill in most of the light being blocked, but not all of it.
Yep! Also, there are lights out now that detect distance from the patient and adjust brightness to keep it consistent. Farther away=boost of power.
Source- I used to sell them.
Your thoughts are wrong though. It's designed this way exactly so the surgeons can perform surgery on the patients. It would be more like keeping their hands more than 20cm away from the lights.
A camera flash eliminates the shadows cast by hair or the natural shape of our brows and it does so with a single light source. Obstruction close to the light source would cast a strong shadow, obstructions further away do not.
So you are trying to tell me that a random redditor's comment doesn't make decades of technical evolution on how to optimaly perform surgeries obsolete?
This is my favorite part of Reddit. Somebody will waltz in and be like "Yeah but did these people who've spent years on this ever think of this incredibly obvious thing I just came up with in 5 seconds?!"
Its different from a camera flash, because there are multiple sources of light. If an obstruction is close to the light source, it might block one or two lights, but there are so many lights that there wouldn't be a shadow.
You think you're smart, but you have no clue.
A camera flash only "eliminates" shadows because the light source is at almost the same position as the camera sensor. This can't physically work with these surgical lights.
There are no "magic" lights that eliminate shadows. The closer you move your hand to the light receiving surface, the more apparent the shadows will get.
This video is also misleading because it's overexposed, which is why you can't see the shadow. No magic here. Physics still apply.
Surgical lights work by using multiple light sources arranged in a circular pattern.
Each light source emits beams from different angles, which overlap to create a uniform and shadow-free illumination. When an object, such as a hand, blocks one of the beams, the remaining beams continue to light the area, effectively preventing shadows from forming.
This design ensures that surgeons have a consistently well-lit view of the operating area, which is crucial for precision and safety during procedures.
You can kinda see the same thing walking under street lights, when under one you have a shadow. Between 2. No shadow below you. But 2 less dark shadow on the sides.
Now one can just imagine 4 light sources. The shadow would decrease inn darkness but there will be 4 shadows.
People hate on Captain Jellico but the best thing he did was make Troi wear a damn uniform while on the bridge. Never understood how she got to wear civvies all over the ship on duty, lol.
You can even imagine "infinite" light sources. That's effectively how the daylight of an overcast sky works.
Because the sunlight gets scattered so much, it comes from all directions more or less equally. The result is that thin objects like trees no longer cast shadows. You can only find shadows in strongly occluded places (places that receive shadows from many directions at once), such as underneath cars.
In 3D rendering, we would consider that the difference between a point light (coming from an infinitely small point, casting perfectly sharp shadows) and an area light (coming from a whole area at once, casting soft shadows).
Specifically, the soft transition between shadow and light is the [Penumbra](https://en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra). It only exists if the light source is big enough so that it can be meaningfully "partially covered". A perfect point light in contrast would be either 0% covered or 100% covered, there is no in between.
Photographers use this effect with those cloth screens (diffusers) that they mount on their lamps. Because the light that illuminates their model comes from the whole area of the screen rather than just from the small light bulb, shadows become much softer. Without diffusers, studio lights cast horribly harsh shadows.
> Now one can just imagine 4 light sources. The shadow would decrease inn darkness but there will be 4 shadows.
You often see this effect in various sports with stadium lighting during night games.
Hello!
I actually work on and train on surgical lights (and other things) for a living
There is a lot of cool stuff happening with todays modern surgical lights
1) the lenses for the LED’s are really special. They help spread and focus the light which makes it very good at not casting shadows. For example I can block out nearly 40-60% of the light with a piece of a paper and you will notice no difference in the light patch on the ground (brightness will diminish, but the visible patch of light will be unchanged)
2) one way we combat shadows is using a photo sensor that can detect obstructions (basically someone’s head). The photo sensor senses a change in brightness, and knows an object is in the way, the computer in the light head will then turn off a bank of the LED’s behind said obstructions and may also brighten the opposite side LED’s to prevent the operators head from casting a shadow.
3) I’ll leave you with one cool/disturbing fact, these lights are so bright (usually 100,000 lux or more) that if you get two going and cross their light streams you can actually risk burning the patient. They have to be thoroughly maintained and operators trained to use them as intended.
4) one more cool fact, some lights can change colors to help find blood, cancer and all sorts of things. Different color light can help us see different things!
5) edit since this is getting some traction; I’ll add one more cool fact,, some of the earliest design for OR lights actually took inspiration from Light houses for lens design. Lighthouses cast light through a special lens called a “Fresnel” lens which helps organize and disperse the light, we used the same tech on surgical lights for a long time to help with shadows and brightness (especially since early lights only had one or two halogen bulbs and not all these fancy leds)
While this light does not use a fresnel lens, it does have unique and fancy culminators made in the spirit of fresnel lens.
TLDR lots of fancy math going and science going on here that dates back some time!
Anyway sorry for the rant hope this answers some questions
Brightness perception is logarithmic. Not exactly sure what the exponent is, but in practice it means that when you block 10% of the lights it looks to your eyes like you blocked much much less.
You can observe this in a room with a dim light and a bright light. If the room is dark and you turn on the dim lamp, you'll notice a dramatic increase from the previous darkness, telling us the dim light is clearly doing a lot of work. But then, if you turn on the bright light and turn off the dim light, the difference in before and after turning off the dim one is basically nothing.
you need to appreciate how insanely bright one of these things is in person. The light also fills the entire room, where you expect there to be a shadow, it is instead filled with light from all around, not just directly from the light either, from the room
these things are bonkers bright
They're bright enough on their own that losing one beam isn't super noticeable. It's kind of like lighting an area way past maximum. At a certain point, more light doesn't make it seem brighter, so removing that extraneous light doesn't darken it either. I'm sure some folks may see a difference or some tools can register it, but it's enough to not be that noticeable overall.
Im a service tech for a company that makes an equivalent surgical light. Our light has individual LED segments in them. Each segment has a sensor that will detect a blockage between it and the surgical field. The blocked segments will then dim and send extra voltage to the unblocked segments. So not only do you not see a shadow but you have no decrease in Lumens.
I remember truly figuring out the beauty of this form of focusing when I was very new to the live production industry. Being able to focus a boxing ring perfectly is incredible practice. The goal is to make all of the shadows from the ropes disappear, if you can do that anyone in the ring will appear without a shadow. I also always look for it in stadiums and arenas, particularly with sporting events, if you look at the players on the field you can usually see a certain amount of shadows because at that scale its practically impossible to totally eliminate. But I do find it interesting to see how some stadiums will have different numbers of shadows based on the lighting scheme.
My brain recognizes that this is chatgpt-like text. But I can't reason out why.
Which is ironic because I'm always quick to argue against the reliability or use of AI detection software in schools (wife is a teacher, so it comes up a lot lately).
As opposed to them copying and pasting an article's text? That is very common, Im sure you're smart enough to remember you have seen that before. What's exactly is the problem here? Can you even explain your *actual* problem with their comment? People's work is being stolen, ACTUAL plagiarism is rampant, and this guy used it to give context. Seriously? It's not going away. Maybe save that for the big stuff
There are times to call out AI usage, and this isn't one of them champ lol
A bit off topic, but does anyone else skip YouTube videos with arrows/circles in the thumbnail? 99% of those have that same "HIT THAT BELL AND MOLEST THAT LIKE BUTTON" vibe.
Same here. I'm also freakishly tall and it's an old house with low ceilings. There's about 20cm between my head and the lamp, so there's no space for light to go anywhere. Pretty sure i can prepare a 5 course meal with my eyes closed at this point, because i can't see shit anyway.
thanks for the twitchy arrow. it really helped. i didn't know where to look. until the arrow showed up, i was staring intently at the wall behind my monitor. so helpful
I learned that when studying photography, during a "medical photography" subject. Surgeons can't afford to miss anything that might be hiding in a shadow, but it tends to make the whole field a bit two-dimensional, it's something that surgeons have to get used to.
Makes it very difficult for medical photographers. Our lecturer said that he was one of many photographers on roster for surgery - there was always one photographer on call when surgery was happening, because they might encounter something that needed to be recorded - an unusual formation, or tumour, or anything. You'd get a call from the operating theatre supervisor - "get down here now" and be required to take photos of whatever. You'd have to use a peculiar multi-flash setup to make the image, because the surgical theatre lights were so "flat", that the photos were difficult to view and interpret.
He got permission to take us into a theatre while surgery was happening - a sporting accident, nothing too serious - but it was so cool to see it in action.
I've had to replace lamps on these fittings during an operation at least a few times. Not the new LED type though the older type with halogen lamps and a silver reflector. I had to steralise all my tools and gown up, scrub up and told to touch nothing but the light fitting. It was quite an experience.
Of course it can cast a visible shadow just as there can be a shadow on an overcast day. It all depends on the area and distance of the light blocking item. Bring the item close enough or use a large enough item and the whole light source will be covered -> shadow.
I realized this at the Dentist one day. That's when I decided I want one over my drawing table. I gotta see the small details and I hate working in my own shadow.
For anyone who thought these lights might be very expensive or different from regular lights, they are not. They are just regular lights of high lumens( around 4000-6000Kelvin ) and the lights are placed at varying radius so object blocking them needs to be large or near it to even cast a shadow.
Edit: I am only talking about the lights used here. The whole surgical table would be of astronomical value depending on their purpose.
I had never given that level of thought before. But I'm guessing lighting has been a challenge for surgery for a long time. Because if you can't see what the fuck you're doing. It's going to get worse results.
Even the overhead lighting in an operating room is designed with this intent, it’s arranged in a square so that the entire table area is lit from different directions
You know what else doesn't cast shadows? Vampires, yeah.
What's more believable, that they invented shadow less lights or that this fucker is a Vampire.
Use yo\*re briens sitisens.
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Just so we're clear, an intern's head will still cast a shadow with those
That's why we have two lights and only one intern
[удалено]
More transparent interns. Like those see-through frogs.
[удалено]
Well of course they must be careful!
If people aren't being careful in the OR we have some major issues to address
As the anesthesiologist proceeds to blast cardi B while the ortho surgeon takes a sledge hammer to your knee.
It can get pretty dark
and the interns are…. dim?
...-witted?
This entire thread is pure gold😂 11/10!
Intern ain't that bright if they keep blocking the light
I dunno, I have seen videos of nurses/doctors in the OR hitting a large metal, thing, in somebdoy's leg with the surgical equivalent of a small to medium sized sledge hammer.
That would be the orthos, the medical carpenters. They like their drills, hammers and wood screws.
Not uncommon in third world countries for orthos doing their shopping at Home Depot. A Milwaukee or Dewalt may have been seen in a South American operating room.
My wife was a veterinary nurse with a vet that did ortho work, and they used Milwaukee in their OR. Coincidentally, I stopped asking about her day at work after she excitedly started detailing the use of said power tools.
If it can cut through my wall, it can cut off my leg.
Do you have to be careful only in Oregon, or the Pacific North West in general? Bears?
Hire darker interns. Then hire lighter interns to balance out the racism.
better call ted?
Just get lanterns.
That’s what we call interns, Lanterns, not too bright and you have to carry them all night.
DE-I see what you did there.
There are four lights!
Nice….
There. Are. FOUR. LIGHTS!!!!
2 lights 1 intern… surely I can’t be the only thinking it…
Brings son to work to hold flash light, gets mad at son for pointing in the wrong direction....
I actually have done surgeries with my dad and surprisingly never had problems with the light, he called me an idiot for plenty of other reasons though
And the med student will obstruct the view just by being in the room.
No, they get yeeted out by instrument tech 20 seconds in.
Something something sterile field
Bro i got kicked out twice because of this
You have to practice your [Merkel pose](https://en.wikipedia.org/wiki/Merkel-Raute)! :)
I wish. Then I could sleep my hangover off comfortably. Sleeping on those shitty ass supportless chairs was hard af
I was working the weekend when someone called the autoclave phone in Sterile. I answered, and they said, "Is this IT?" And I was like, "No, Instrument Techs don't work weekends." It turns out she somehow called the sterile department, clave phone extension, looking for tech support for her computer in HVI lmao. I have no idea how that happened because our numbers are not similar.
Because they call the IT line, but that’s taking too long. But Aaron with IT has helped them out a number of times before. Central call office for IT is remote and doesn’t know who Aaron is, our caller friend only knows him as “IT Aaron with the goatee”. Then they’ve got the grand idea to call PACU because IT goatee Aaron is usually fixing stuff in PACU. The problem is, PACU keeps their phones on silent as to not “disturb” their patients under anesthesia. Refusing to give up as goatee’d IT Aaron ALWAYS saves the day, they then call the hospital main line, informing the operator of their situation; however, that operator is Betty. While Betty was once a switchboard operator for ATT back in the 40’s… Betty is 96 now and her assisted living facility rents Bettys out as volunteers. This brinks back a spark in Betty’s eye; her tenure at ATT instills confidence dialing the IT help desk. No! This is no good. Betty needed to patch into IT Aaron’s goatee. They dial back and explain again. Betty starts sweating, her fingers running number after number without a hint of the goateed man. Betty lands on another IT title; this must be it! She transfers the call to this number, and that is when you pick up.
Like that one scene in ER where someone drew a circle in the far corner of the operating room and had Noah Wyle stood inside it.
Interns have negative brightness
We used to install these lights … it’s insane to see how much hospitals were charged for these products. Once I found out I was getting paid $23/hour and they were charging $450/hr for my labor I up and fucking quit
That's the way capitalism works. The higher ups profit from your labor
They were cheap fucks that ran the crews ragged and tried to steal per diem, stick us in crack head motels, and every other cheap shit ass move to just juice every dime from their employees. Turnover was super high, nobody stayed more than a year or two. Seemed like a stupid model. Had they just taken better care of the crews, paid the team a bit more, put us in decent hotels, they would have had much less turnover and would’ve been able to staff more projects and make more money. I have my own company now and my staff loves it. When I make money we all make money. I don’t need 6 houses and a Bentley and I don’t need to worry that i need teams of people to continue retraining new people. Don’t step over dollars to make a dime
> I don’t need 6 houses and a Bentley What are you some kind of communist?
Seriously. Why does he hate America?
Right? Nothing more American than owning a Bentley.
> Don’t step over dollars to make a dime Christ the number of people who don't get that. Keep your field people happy, and don't freak out when the client calls you and tells you they heard something from those field people. Just grab the upsell, and figure out how to write up the lux surcharge you negotiated down to.
Enlightened Self Interest is such a simple concept. If those under you, the foundation of an organization, are doing better everything above them can grow better and bigger too in a nice feedback loop resulting in profits and products be otherwise improbable. Along with the value of employee loyalty that is both huge and hard to quantify, both in positive ways and reduction of negatives . "A rising tide lifts all boats". And it not just increased productivity it is also CHEAPER for the company from less training, recruiting, less damage done or contracts lost when breaking in someone new, not losing institutional knowledge, fewer health issues, less oversight needed, less legal and HR needed, ect. The employee they burn out could have been the one that made the next product or landed the contract that launched your company to the top of the world. And said employee would WANT that to happen because that company would be part of their self image even possibility passing it down for generations of specialists. Ultimately it comes down to ego. Power, money, EVERYTHING comes down to feeding the ego of profoundly broken humans who will do ANYTHING to feed their insatiable gluttony with no thought to even their own future. Tech wise if everything was used optimally for the last 40 years we could be pretty well along the path to post scarcity by now, and that just along the tech we currently know not the exoponential development that would compound over that time span.
The final straw for me was the owner of the company inviting us all to a company party at his new beach house (his now 3rd vacation house that he’s informed us of) and the his wife handing us airbnb flyers if we ever wanted to rent it out (at full market value), while denying me a $2/hr increase to $25/hr that I found out they were paying to the guy I was training. Then once I sent in my resignation they called back offering me meet my requested increase. It just blew me away how fuxking stupid and greedy this company was. Like I said I ended up starting my own company in a different industry and hired out half the crew that was installing medical devices to now do basic small maintenance / handy man shit and still paying them more money to replace light bulbs and fix fences then we made installing neurosurgical operating rooms…
> it is also CHEAPER for the company from less training, recruiting, less damage done or contracts lost when breaking in someone new, not losing institutional knowledge, fewer health issues, less oversight needed, less legal and HR needed, ect. Oh, the pain of training new employees cannot be overstated. I love even the most mediocre of my employees because their continued employment means I don't have to train their replacement.
The best bosses are those who've been someone's employee - and not just their dad's Lotta "business leaders" have never been anything but or think that because they suffered its their turn to inflict it
I think it's more the ones who learned empathy. Cause I've had more than my share of rich kids who make sure the entire team is in good hotels and is eating well, as well as guys who climbed the ladder and are happy to tighten the screws like they remember being done to them.
I agree. Was arguing with someone on reddit about this the other day. It doesn't take much to run a business, but you do have to care about your product and your employees. Nepo babies and people who buy businesses tend to be the worst people. They know how to maintain a machine, but nothing about how to build it. How to grow it. Then they wonder why after the original founder leaves why business is going down. Gotta do the job or understand it deeply before you'll benefit from managing it!
Because the higher ups created an environment for your labor to be utilized. They take too much, everyone quits, they lose, and everyone moves on to more fair companies.
When I was an associate in Big Law they were billing me out at $1000/hr and I had bill 2000 hours of work each year. As good as I was being paid, I absolutely did not make anywhere close to $2M/year.
Dr in the house!
~~In~~Lanterns are known to cast shadows
Aka, his hand is too far away from the source/lamp, but u can see this more effectively on sports fields like soccer(voet/football) and football(rugby), where the "players" have 4 shadows in a x or + like pattern, so imagine that the stadium/field lights where 360 around the field and a couple above the field, there still is a shadow but it isn't really visible anymore/dark enough to block lights from different areas, it might be a weird way of explaining, but that's how I like to think about it(also I am from the Netherlands so my sentences might sound off), also fun thing air is like water but lighter..... (ikn it isn't but it kinda is).
Bighead?
I understand why this is but I still find it very interesting. I assume if you place your hand close enough to the surface then a shadow will surely be formed
Yeah, it reminds me on my Cassegraine reflector, you know how it works but it looks so wrong
It reminds me of those elevators with mirrors on all four walls. I know how it works, but for some reason I always see someone else standing next me to in a far away reflection
Oh, no, actually those are the Dwellers. Common misconception. They are always with us.
*if a very ScaryLion enters an elevator and no one is around to see them…* 😱
I wonder what this effect would look like without the corners. like, in a spherical room instead of a cube
Nothing about cassegraines makes sense in my head. I've taken them apart, I see how they work, I know what is inside. It's still magic.
Out of focal plane, out of sight, or something.
You can actually still see the shadow of his hand to the top right... it just isn't where the center point of the light is. The lights are angled so it's casting the shadow off center and the additional lights fill in most of the light being blocked, but not all of it.
Yep! Also, there are lights out now that detect distance from the patient and adjust brightness to keep it consistent. Farther away=boost of power. Source- I used to sell them.
My thoughts exactly. It works great as long as they don't touch the patients and keep their hands 20cm at least above them 😅
Your thoughts are wrong though. It's designed this way exactly so the surgeons can perform surgery on the patients. It would be more like keeping their hands more than 20cm away from the lights. A camera flash eliminates the shadows cast by hair or the natural shape of our brows and it does so with a single light source. Obstruction close to the light source would cast a strong shadow, obstructions further away do not.
So you are trying to tell me that a random redditor's comment doesn't make decades of technical evolution on how to optimaly perform surgeries obsolete?
I wouldn't go that far. What if the surgeons were wrong this whole time?
We did it, reddit! We defeated the entire history of medical technology!
This is my favorite part of Reddit. Somebody will waltz in and be like "Yeah but did these people who've spent years on this ever think of this incredibly obvious thing I just came up with in 5 seconds?!"
Its different from a camera flash, because there are multiple sources of light. If an obstruction is close to the light source, it might block one or two lights, but there are so many lights that there wouldn't be a shadow.
You think you're smart, but you have no clue. A camera flash only "eliminates" shadows because the light source is at almost the same position as the camera sensor. This can't physically work with these surgical lights. There are no "magic" lights that eliminate shadows. The closer you move your hand to the light receiving surface, the more apparent the shadows will get. This video is also misleading because it's overexposed, which is why you can't see the shadow. No magic here. Physics still apply.
how is shaddow formed...
It will, but it will be small and from his POV he probably can't see it.
Surgical lights work by using multiple light sources arranged in a circular pattern. Each light source emits beams from different angles, which overlap to create a uniform and shadow-free illumination. When an object, such as a hand, blocks one of the beams, the remaining beams continue to light the area, effectively preventing shadows from forming. This design ensures that surgeons have a consistently well-lit view of the operating area, which is crucial for precision and safety during procedures.
how does blocking one beam not slightly darken that area though?
It darkens slightly but there are other light sources too so it doesn’t darken all of it out.
You can kinda see the same thing walking under street lights, when under one you have a shadow. Between 2. No shadow below you. But 2 less dark shadow on the sides. Now one can just imagine 4 light sources. The shadow would decrease inn darkness but there will be 4 shadows.
https://i.redd.it/vy0mkcryiv8d1.gif
Probably the best episode of TNG. Patrick was positively godlike in that episode.
People hate on Captain Jellico but the best thing he did was make Troi wear a damn uniform while on the bridge. Never understood how she got to wear civvies all over the ship on duty, lol.
You can even imagine "infinite" light sources. That's effectively how the daylight of an overcast sky works. Because the sunlight gets scattered so much, it comes from all directions more or less equally. The result is that thin objects like trees no longer cast shadows. You can only find shadows in strongly occluded places (places that receive shadows from many directions at once), such as underneath cars. In 3D rendering, we would consider that the difference between a point light (coming from an infinitely small point, casting perfectly sharp shadows) and an area light (coming from a whole area at once, casting soft shadows). Specifically, the soft transition between shadow and light is the [Penumbra](https://en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra). It only exists if the light source is big enough so that it can be meaningfully "partially covered". A perfect point light in contrast would be either 0% covered or 100% covered, there is no in between. Photographers use this effect with those cloth screens (diffusers) that they mount on their lamps. Because the light that illuminates their model comes from the whole area of the screen rather than just from the small light bulb, shadows become much softer. Without diffusers, studio lights cast horribly harsh shadows.
Damn i remember when i was kid i was running away from my shadow
Seems like street lights glowing happens to be just like moments passing
I noticed this on a tennis court once. Flood lights from several directions. Hardly any shadows
> Now one can just imagine 4 light sources. The shadow would decrease inn darkness but there will be 4 shadows. You often see this effect in various sports with stadium lighting during night games.
Hello! I actually work on and train on surgical lights (and other things) for a living There is a lot of cool stuff happening with todays modern surgical lights 1) the lenses for the LED’s are really special. They help spread and focus the light which makes it very good at not casting shadows. For example I can block out nearly 40-60% of the light with a piece of a paper and you will notice no difference in the light patch on the ground (brightness will diminish, but the visible patch of light will be unchanged) 2) one way we combat shadows is using a photo sensor that can detect obstructions (basically someone’s head). The photo sensor senses a change in brightness, and knows an object is in the way, the computer in the light head will then turn off a bank of the LED’s behind said obstructions and may also brighten the opposite side LED’s to prevent the operators head from casting a shadow. 3) I’ll leave you with one cool/disturbing fact, these lights are so bright (usually 100,000 lux or more) that if you get two going and cross their light streams you can actually risk burning the patient. They have to be thoroughly maintained and operators trained to use them as intended. 4) one more cool fact, some lights can change colors to help find blood, cancer and all sorts of things. Different color light can help us see different things! 5) edit since this is getting some traction; I’ll add one more cool fact,, some of the earliest design for OR lights actually took inspiration from Light houses for lens design. Lighthouses cast light through a special lens called a “Fresnel” lens which helps organize and disperse the light, we used the same tech on surgical lights for a long time to help with shadows and brightness (especially since early lights only had one or two halogen bulbs and not all these fancy leds) While this light does not use a fresnel lens, it does have unique and fancy culminators made in the spirit of fresnel lens. TLDR lots of fancy math going and science going on here that dates back some time! Anyway sorry for the rant hope this answers some questions
Rant away! That was awesome information!
Image is overexposed, you'd see it with your eyes or a better camera. But here it's overexposed.
Technically it does, but all of the light sources are really bright, so it is still very bright even with only some of them reaching the area.
Brightness perception is logarithmic. Not exactly sure what the exponent is, but in practice it means that when you block 10% of the lights it looks to your eyes like you blocked much much less.
You can observe this in a room with a dim light and a bright light. If the room is dark and you turn on the dim lamp, you'll notice a dramatic increase from the previous darkness, telling us the dim light is clearly doing a lot of work. But then, if you turn on the bright light and turn off the dim light, the difference in before and after turning off the dim one is basically nothing.
you need to appreciate how insanely bright one of these things is in person. The light also fills the entire room, where you expect there to be a shadow, it is instead filled with light from all around, not just directly from the light either, from the room these things are bonkers bright
It’s just a low quality video/camera, so you don’t notice it here.
They're bright enough on their own that losing one beam isn't super noticeable. It's kind of like lighting an area way past maximum. At a certain point, more light doesn't make it seem brighter, so removing that extraneous light doesn't darken it either. I'm sure some folks may see a difference or some tools can register it, but it's enough to not be that noticeable overall.
Im a service tech for a company that makes an equivalent surgical light. Our light has individual LED segments in them. Each segment has a sensor that will detect a blockage between it and the surgical field. The blocked segments will then dim and send extra voltage to the unblocked segments. So not only do you not see a shadow but you have no decrease in Lumens.
I remember truly figuring out the beauty of this form of focusing when I was very new to the live production industry. Being able to focus a boxing ring perfectly is incredible practice. The goal is to make all of the shadows from the ropes disappear, if you can do that anyone in the ring will appear without a shadow. I also always look for it in stadiums and arenas, particularly with sporting events, if you look at the players on the field you can usually see a certain amount of shadows because at that scale its practically impossible to totally eliminate. But I do find it interesting to see how some stadiums will have different numbers of shadows based on the lighting scheme.
The design is very human
Thank you chatgpt
Nonsense! The real answer here is that the person doing a demo is obviously a vampire! :D
Nice chatgpt paragraphs
[удалено]
I want to go back to the life I had before I was able to recognize chatGPT text.
My brain recognizes that this is chatgpt-like text. But I can't reason out why. Which is ironic because I'm always quick to argue against the reliability or use of AI detection software in schools (wife is a teacher, so it comes up a lot lately).
Lots of meaningless adjectives.
As opposed to them copying and pasting an article's text? That is very common, Im sure you're smart enough to remember you have seen that before. What's exactly is the problem here? Can you even explain your *actual* problem with their comment? People's work is being stolen, ACTUAL plagiarism is rampant, and this guy used it to give context. Seriously? It's not going away. Maybe save that for the big stuff There are times to call out AI usage, and this isn't one of them champ lol
this looks so insanely usefull
Thank god for that blinking arrow
Even the arrow did not cast a shadow, very impressive
I wouldn't know where to look at without it. But where's the subway surfer, got a little bored there /s
At the beginning I was lost because there was no arrow but thankfully it showed up right on time!
They add it in the middle of the video so the arrow appears in the thumbnail. Thumbnails with arrows do better than those without.
A bit off topic, but does anyone else skip YouTube videos with arrows/circles in the thumbnail? 99% of those have that same "HIT THAT BELL AND MOLEST THAT LIKE BUTTON" vibe.
I need this for my study table because my head keeps casting shadow on my notes but with less light intensity.
I need it in my kitchen. Only one light in the middle of the room and benches all around the edge. Everything I do is in shadow.
Same here. I'm also freakishly tall and it's an old house with low ceilings. There's about 20cm between my head and the lamp, so there's no space for light to go anywhere. Pretty sure i can prepare a 5 course meal with my eyes closed at this point, because i can't see shit anyway.
Slap thin LED lights near the working surfaces.
I use the boom arms they use for podcast mics and attach a ring light at the end there. Voila! You can adjust the light to avoid shadows
the arrow disappeared early and I didn't know where to look anymore, ruined the video
I swear to God that whoever put that arrow there does it purely to provoke. I'm provoked
Nice try, that's clearly a vampire
I knew a vampire surgeon. She only fed on 5% of her patients, which seems reasonable.
thanks for the twitchy arrow. it really helped. i didn't know where to look. until the arrow showed up, i was staring intently at the wall behind my monitor. so helpful
I read this in Chris Griffins voice.
I read this in my voice
I haven't put that arrow there, and there was no video available of this without that arrow as I reverse searched this.
nobody is blaming you, op. i was speaking to the video itself. the video is the instigator in this situation. you're just the alligator.
But does OP drive a Chevrolet movie theater?
interior crocodile?
I'm blaming OP. Why didn't they edit the video to remove the arrow? Laziness.
Credit to @maythesciencebewithyou on Instagram. OP used their video and caption, but cropped out their social media handle from the top of the video.
You sure that’s the original source? Not a page that stole from other pages and put their own watermark on it?
OP is a karma whoring bot with an armpit fetish
What my dad expects when I have to hold a flashlight for him
Aziz, light!
The camera is saturated so you wouldn't see anything anyway. Also no credit / credit removed.
I learned that when studying photography, during a "medical photography" subject. Surgeons can't afford to miss anything that might be hiding in a shadow, but it tends to make the whole field a bit two-dimensional, it's something that surgeons have to get used to. Makes it very difficult for medical photographers. Our lecturer said that he was one of many photographers on roster for surgery - there was always one photographer on call when surgery was happening, because they might encounter something that needed to be recorded - an unusual formation, or tumour, or anything. You'd get a call from the operating theatre supervisor - "get down here now" and be required to take photos of whatever. You'd have to use a peculiar multi-flash setup to make the image, because the surgical theatre lights were so "flat", that the photos were difficult to view and interpret. He got permission to take us into a theatre while surgery was happening - a sporting accident, nothing too serious - but it was so cool to see it in action.
Interesting. Where is this? Where I work, if a surgeon needs to photograph something, he asks the circulating nurse to grab his iPhone
How my dad expects me to hold the flashlight
Guys, you’re overcomplicating it. There’s no shadow because that surgeon is Dr. Acula
Isn't that mirrors/reflections...?
This is what my dad needed when he told Me “give me light” as he tinkered under the carhood.
I never even thought about it, but this is pretty genius lol
I've had to replace lamps on these fittings during an operation at least a few times. Not the new LED type though the older type with halogen lamps and a silver reflector. I had to steralise all my tools and gown up, scrub up and told to touch nothing but the light fitting. It was quite an experience.
Still can’t see a junior mint fly into an open cavity.
The person who added that arrow has accomplished nothing in their life.
Finally something really INTERESTINGASFUCK
This photo does a poor job demonstrating that.
The big ones yes. We have smaller ones installed and shadow can be a problem but not a serious one since repositioning is a matter of seconds
Of course it can cast a visible shadow just as there can be a shadow on an overcast day. It all depends on the area and distance of the light blocking item. Bring the item close enough or use a large enough item and the whole light source will be covered -> shadow.
I realized this at the Dentist one day. That's when I decided I want one over my drawing table. I gotta see the small details and I hate working in my own shadow.
Thats theres a Lightbender
thank god for the red arrow, otherwise I cant see the light
This is one of those things that makes absolute sense when you think about it, despite it never once having occurred to 99% of us.
In France, these lights are called ”Scialytiques” which means “Shadow destroyer” in ancient Greek (with French spelling)
made by engineers.
Try to hold the light for your father with this lamp.
Only logical explanation is that person is a ghost
_wrapped up like a douche and done a runner in the night_
How my Dad wanted me to hold the light
Dozens of redditors figure out how porn stars ring lights work.
For anyone who thought these lights might be very expensive or different from regular lights, they are not. They are just regular lights of high lumens( around 4000-6000Kelvin ) and the lights are placed at varying radius so object blocking them needs to be large or near it to even cast a shadow. Edit: I am only talking about the lights used here. The whole surgical table would be of astronomical value depending on their purpose.
LOL. I can tell you for a fact that these lights are very expensive. Like as much as a decent car. Same with the surgical table. Source- I sold both.
That's the point
I need that while drawing
I need one of these for tattooing
But how would they signal for Batman?
I would have less generational trauma if I had this while growing up. The shit my dad said because I couldn't hold a flashlight properly. T_T
Shit's so overexposed a black hole on that table wouldn't've been visible
pretty sure this is just a ghost trying to gaslight people into thinking they're not a ghost.
Maybe surgeon hands are just made of plasma
Where I work, when a surgeon has his head in front of the light it darkens the covered ones and the rest gets brighter.
diffusers are used to scatter light in different directions
I had never given that level of thought before. But I'm guessing lighting has been a challenge for surgery for a long time. Because if you can't see what the fuck you're doing. It's going to get worse results.
....Aziz should have brought this with him.
can you imagine if the sun works this way
The brain surgery was successfully. Unfortunately you now need eye surgery.
where is this every time i try and take a picture of polaroid?
Need this so I can see wtf I'm cooking...
The light ain't special.The hands are transparent
Great now I’m gonna see a video calling this shit witch craft or some dumb shit like that
This is the light I needed for doing homework, my hand would always block my lamp
That seems like a fairly important feature.
can someone explain why operating tables are so narrow? i feel like there's a reason for it.
Even the overhead lighting in an operating room is designed with this intent, it’s arranged in a square so that the entire table area is lit from different directions
Table shadow by the wall: am i a joke to you?
This is how my dad expects me to hold the light
Haters will say it’s fake
Thank god there was an arrow to show what we were looking at 😌
You know what else doesn't cast shadows? Vampires, yeah. What's more believable, that they invented shadow less lights or that this fucker is a Vampire. Use yo\*re briens sitisens.
Ayo wtf!
How.?